20170722_php_单例模式

 1 <?php
 2 
 3 class myClass{
 4     
 5     private static $obj = null;
 6 
 7     private function  __construc(){
 8 
 9     }
10 
11     public static function getInterface(){
12         if(self::$obj == null){
13             self::$obj = new self();
14         }
15 
16         return self::$obj;
17     }
18 
19     public function __toString(){
20         return ‘this is __toString‘;
21     }
22 }
23 
24 $obj = myClass::getInterface();
25 echo $obj;